1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

use crate::{CodeBuffer, Expression};

/// An element with expression parameters.
pub trait WithParams {
    /// Gets the parameters.
    fn params(&self) -> &[Box<dyn Expression>];

    /// Adds the parameter.
    fn with_param<P>(self, param: P) -> Self
    where
        P: 'static + Expression;

    /// Adds the parameter.
    fn add_param<P>(&mut self, param: P)
    where
        P: 'static + Expression;

    /// Writes the parameters.
    fn write_params(&self, b: &mut CodeBuffer) {
        if let Some((first, rest)) = self.params().split_first() {
            first.write(b);
            for param in rest {
                b.write(", ");
                param.write(b);
            }
        }
    }

    /// Writes the parameters with parentheses.
    fn write_params_with_parens(&self, b: &mut CodeBuffer) {
        b.write("(");
        self.write_params(b);
        b.write(")");
    }
}